Respiratory System

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Across
  1. 1. is a respiratory organ found in many aquatic organisms that extracts dissolved oxygen from water and excretes carbon dioxide.
  2. 3. Located just below the larynx, is the main airway to the lungs.
  3. 5. are tiny air sacs within the lungs where the exchange of oxygen and carbon dioxide takes place.
Down
  1. 2. is a small hole behind each eye that opens to the mouth in some fish.
  2. 4. is essential to human speech.